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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets, net operating loss carryforwards | $ 1,075 | $ 238
Capital loss carryforwards | 559 | 547
Deferred tax assets, accrued liabilities | 262 | 125
Fair value of derivative financial instruments | 129 | 33
Deferred tax assets, asset retirement obligations | 109 | 94
Investment in subsidiary |  | 441
Other, including tax credits | 138 | 106
Total deferred tax assets before valuation allowance | 2,272 | 1,584
Less: valuation allowance | (893) | (1,355)
Net deferred tax assets | 1,379 | 229
Deferred tax liabilities, property and equipment | (1,630) | (213)
Deferred tax liabilities, other | (29) |
Total deferred tax liabilities | (1,659) | (213)
Net deferred tax asset (liability) | $ 280 | $ 16

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